南北方黑木耳916品种的形态特征及营养成分比较     

高国赋  罗建军  卢红玲  钮雅丽  魏宝阳 《湖南农业科学》2014,(21)

为了比较南北方黑木耳916品种的形态特征和营养成分,采用显微镜观察、分光光度计检测、ICP-AES元素分析等方法,观察了南北方黑木耳916的孢子、子实体切面,测定其主要化学成分及矿质元素的含量。结果表明,南北方黑木耳均为朵状、褐色,但南方黑木耳颜色稍浅,子实体稍小,子实体中的胶质略多于北方的;南北方黑木耳的孢子形态结构相似,均透明,呈月牙状、肾形或柱形;在营养成分上,南方黑木耳的水分、粗脂肪、蛋白质和多糖的含量高于北方黑木耳,而粗灰分和黑色素的含量低于北方黑木耳,钠、铁含量也低于北方黑木耳。  相似文献   

苎麻对重金属复合污染土壤的修复效率研究   总被引：1，自引：0，他引：1  

李雅贞  罗琳  张琪  晏洪铃 《湖南农业科学》2014,(17)

通过盆栽试验模拟了砷(As)、铅(Pb)、锌(Zn)复合污染环境,并研究了复合污染环境下不同As浓度对苎麻生长及其重金属在植株体内吸收、富集和迁移的影响。结果表明,在复合污染情况下,低浓度(≤100 mg/kg)的As对苎麻生长没有显著影响,而高浓度的As可使苎麻植株变矮、叶片易损、分蘖数及生物量减少,但仍能完成正常生理周期并且无严重毒害症状出现。由此表明,苎麻对As/Pb/Zn复合污染土壤具有一定的耐受性。且在试验条件下,苎麻植株对As、Pb、Zn的转运系数分别在0.11~2.43、0.11~1.03和0.59~1.66之间,苎麻地上部对As、Pb、Zn的富集系数分别在0.01~0.45、0.01~0.12和0.17~1.48之间,表明苎麻可作为As、Pb、Zn单一或复合污染土壤修复的植物。  相似文献   

4个桑树品种桑葚多糖提取条件的优化及其含量比较   总被引：2，自引：0，他引：2  

牛天羽  刘洪章  刘树英 《湖南农业科学》2014,(17)

以吉林省东部和中部地区的成熟黑桑、白桑、栽培种蒙桑及野生蒙桑的桑葚为材料,通过单因素及响应面法试验,对桑葚多糖提取条件进行了优化,并对4个品种桑葚的多糖含量进行比较,结果表明,桑葚多糖的最佳提取条件为温度91℃,提取时间53 min,料液比1︰48。各品种桑树桑葚多糖含量由高到低排列依次为:栽培种蒙桑(223.658 mg/g)白桑(212.575 mg/g)黑桑(179.920 mg/g)野生蒙桑(146.123 mg/g)。  相似文献   

棉株形态的生物全息及其应用   总被引：2，自引：0，他引：2  

易福华 《棉花学报》1999,(5)

研究了棉株形态上器官与器官、器官与整体的全息对应关系：叶枝与主茎、叶形与株形、裂叶与分枝、花器官与株形、叶蕾比与生长中心变化、芽分化方向与生长状态。从顶心、叶形、叶蕾比的长相诊断，早熟省工栽培以及调节异花授粉率上分析了上述全息相关的应用  相似文献   

Variation for plant characters and for performance of softwood cuttings of Rosa canina ‘Inermis’ seedlings     

D. P. De Vries  Lidwien A. M. Dubois 《Euphytica》1987,36(2):407-412

Summary Thirty, one-season-old Rosa canina mg src="/content/h53443371311m802/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">Inermismg src="/content/h53443371311m802/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> seedlings (8–12 mm in diameter) were grown in the greenhouse. After 5 months, single-node softwood cuttings were made of each plant. Analysis of variance demonstrated marked differences between the internode length, number of leaflets per leaf and the leaf area of the original seedling, and between the time of axillary bud-break, axillary sprout length and weight of adventitious roots of their 23-day-old cuttings. Clonal root weight of cuttings was highly significantly correlated with: number of leaflets per leaf (r=–0.65), leaf area (r=+0.65), and days to axillary bud-break (r=+0.62). The origin of heterogeneity among mg src="/content/h53443371311m802/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">Inermismg src="/content/h53443371311m802/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> seedling rootstocks, its probable effect on the flower production of cut roses and its possible use in the selection for clonal rootstocks are discussed.  相似文献   

Accelerated Generalized Minimal Residual Algorithm     

LIU Ren-  YANG Da-di 《保鲜与加工》2006,(10):121-124

This paper studies the fundamental theory of the generalized minimal residual algorithm(GMRES(m))in Krylov subspace and specially the relationship between residual vector and Krylov subspace.The relationship of the algorithm convergence and the subspace be selected is further researched according the linear system about residual vector.It is posed that the convergence can be slowed down because there are so many very small eigenvalue in magnitude.And a accelerated method(AGMRES(m)) is proposed to improve the convergence of the GMRES(m).Theoretical analysis and numerical results show the reliability and efficiency of the algorithm.  相似文献   

Crossability relationships of andean potato varieties of three ploidy levels     

M. T. Jackson  P. R. Rowe  J. G. Hawkes 《Euphytica》1978,27(2):541-551

Summary The formation of triploids in 4x×2x crosses was studied in primitive potato varieties from the Andes of Peru and Bolivia. Triploid frequencies were as high as 80–100% in some crosses, although the actual number of seeds was low. The mg src="/content/m88pu24108446833/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">triploid blockmg src="/content/m88pu24108446833/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> varied according to the tetraploid parent, and was never entirely absent. The likelihood of triploid formation was studied in 4x×2x crosses where pollen from both tetraploids and diploids of known genotype was used. Even though the diploids were chosen for their non-production of 2n gametes, as detected in pollen grain size, 66% of the hybrids were tetraploid. The amount and probability of gene-flow between the tetraploid and diploid gene-pools, either directly through 2n gametes or through mg src="/content/m88pu24108446833/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">triploid bridgesmg src="/content/m88pu24108446833/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> was examined. Most of the 20 cultivars of S. x chaucha produced seed in crosses with tetraploids and diploids, although the fertility of the latter crosses was four times higher. The female fertility of some of the triploids thus allows them to exchange genes with the tetraploids and diploids, although gene-flow occurs more rapidly through direct transfer from diploids to tetraploids via 2n gametes.  相似文献   

水杨酸对黄花梨采后衰老和膜脂过氧化的影响   总被引：9，自引：0，他引：9  

王大平  刘奕清  朱钧  朱建勇 《西南大学学报(自然科学版)》2005,27(5):621-623,633

黄花梨果实采后用浓度为0.1 g/L,0.3 g/L的水杨酸(SA)溶液浸泡20 m in后,在(25±1)℃的贮藏条件下,研究了水杨酸处理对黄花梨果实采后衰老和膜脂过氧化的影响。结果表明,与以清水为对照相比,0.1 g/L SA处理能抑制SOD,CAT,POD活性的下降,降低果肉组织的相对电导率和MDA积累量,从而延缓了果实的成熟衰老;而0.3 g/L SA处理无明显影响。  相似文献   

The study on method to draw large-scale soil map in diluvial soil area in Hokkaido, using digital elevation data for a 10 m grid     

Katsuhisa NIWA  Jun YOKOBORI  Kiyoshi OHBUCHI  Koji KIKUCHI 《Soil Science and Plant Nutrition》2006,52(2):253-254

(pp. 59–66)
In order to understand the detailed soil distribution of a terrace with a diluvial deposit, the method to draw a large-scale soil map was studied in Urausu Town of Sorachi district by combinig soil survey and digital elevation data for a 10 m grid.
The results are summarized as follows:

• 1) 

  From a soil survey, soils in the research area were classified into 3 soil series groups according to Classification of Cultivated Soils in Japan, Third Approximation, which were Skeletal Terrace Brown Forest Soils, Fine-textured Aquic Brown Forest Soils and Fine-textured Haplic Gray Upland Soils. In addition, Fine-textured Haplic Gray Upland Soils · were classified into 2 categories based on the abundance of gravel in the subsoil.

    相似文献